Hach DR/850 Procedures Manual page 126

CHLORINE, TOTAL,
5. :
Press
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L Cl2
Note: If Reagent Blank
Correction is on, the
display may flash "limit".
See Section 1.
9.
After the timer beeps,
place the prepared
sample into the cell
holder. Tightly cover the
sample cell with the
instrument cap.
continued
6.
Fill a second cell to
the 10-mL mark with
sample.
10.
Press:
READ
The cursor will move to
the right, then the result
in mg/L total chlorine
will be displayed.
Note: It the sample
temporarily turns yellow
after sample addition, or the
display flashes "limit", it is
due to high chlorine levels
Dilute a fresh sample and
repeat the test. A slight loss
of chlorine may occur during
dilution. Multiply the result
by the dilution factor; see
Section 1. Or use the High
Range Total Chlorine test,
program #8.
7.
Add the contents of
one DPD Total Chlorine
Powder Pillow to the
sample cell (the
prepared sample). Cap
and swirl the sample cell
vigorously to dissolve
the powder.
Note: It is not necessary
that all the powder
dissolves.
Note: Standard Adjust may
be performed using a
prepared standard (see
Standard Adjust in
.
Section 1).
126
8.
Press:
TIMER ENTER
A three-minute reaction
period will begin. A
pink color will develop
if chlorine is present.
Note: The SwifTest
Dispenser for Total
Chlorine can be used in
place of the powder pillows
in step 7.